class Circle{
	void printArea(double r){
		System.out.println("The circle's area = "+(r*r*3.1415926));
	}
}

class Rectangle{
	void printArea(double width,double height){
		System.out.println("The rectangle's area = "+(width*height));
	}
}

public class MainClass{
	public static void main(String [] args){
		Circle circle = new Circle();
		Rectangle rect = new Rectangle();
		circle.printArea(10);
		rect.printArea(20,20);
	}
}